At the sizes you have right now the red devil will hit maturity first and prolly wipe everything out except the dovii and still maybe the dovii. but once the dovii and umbee hit maturity its up to who wants it the most and by then the RD will be pretty large. umbees dont normally get really aggressive till they hit around 8". at small sizes you can keep a group of umbees together and have a decent turnout. if you tried that with dovii you will usually end up with just a pair as they have killed everyone else off. IMO i think your playing with fire having that group together unless you can put them all in a 240 or larger untill they hit maturity then youll be making some moves. No offense bro but why not be patient untill you have the space to properly house each fish unless your going for survival of the fittest. I know it can be hard to say no sometimes cause i catch myself all the time
lol